body {
    width: 100%;
    height: 3000px;
    min-width: 320px;
    max-width: 640px;
    margin: 0 auto;
    font-size: 14px;
    font-family: -apple-system, Helvetica, sans-serif;
    color: #666;
    line-height: 1.5;
}

* {
    box-sizing: border-box;
}

/*点击高亮我们需要清除清除  设置为transparent 完成透明*/

* {
    -webkit-tap-highlight-color: transparent;
}


/*在移动端浏览器默认的外观在iOS上加上这个属性才能给按钮和输入框自定义样式*/

/*禁用长按页面时的弹出菜单*/

img,
a {
    -webkit-touch-callout: none;
}

a {
    color: #666;
    text-decoration: none;
}

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

img {
    vertical-align: middle;
}

div {
    /* css3 盒子模型 */
    box-sizing: border-box;
}

.clearfix:after {
    content: "";
    display: block;
    line-height: 0;
    visibility: hidden;
    height: 0;
    clear: both;
}

.app {
    width: 100%;
    height: 45px;
}

.app ul li {
    float: left;
    display: block;
    height: 45px;
    color: #fff;
    text-align: center;
    line-height: 45px;
}

.app ul li:nth-child(1) {
    width: 8%;
    background-color: #333;
}

.app ul li:nth-child(1) img {
    width: 10px;
}

.app ul li:nth-child(2) {
    width: 10%;
    background-color: #333;
}

.app ul li:nth-child(2) img {
    width: 30px;
}

.app ul li:nth-child(3) {
    width: 57%;
    background-color: #333;
}

.app ul li:nth-child(4) {
    width: 25%;
    background-color: #F63515;
}

.search_wrap {
    overflow: hidden;
    position: fixed;
    width: 100%;
    min-width: 320px;
    max-width: 640px;
    height: 44px;
    /* background-color: red; */
}

.search_wrap .search_btn {
    position: absolute;
    left: 0;
    top: 0;
    width: 40px;
    height: 44px;
    /* background-color: pink; */
}

.search_wrap .search {
    position: relative;
    height: 30px;
    background-color: #fff;
    border-radius: 15px;
    margin: 7px 47px;
}

.search_wrap .search_login {
    position: absolute;
    right: 0;
    top: 0;
    width: 40px;
    height: 44px;
    text-align: center;
    line-height: 44px;
    color: #fff;
    /* background-color: purple; */
}

.search_wrap .search_btn::after {
    content: "";
    display: block;
    height: 20px;
    width: 18px;
    background: url(../images/btn.png) no-repeat;
    background-size: 20px 18px;
    margin: 14px 0 0 15px;
}

.search_wrap .search .icon_jd {
    position: absolute;
    left: 7px;
    top: 7px;
    height: 15px;
    width: 20px;
    background: url(../images/JD-icon.png) no-repeat;
    background-size: 20px 15px;
}

.search_wrap .search .icon_jd::after {
    position: absolute;
    content: "";
    top: -2px;
    right: -10px;
    display: block;
    height: 20px;
    width: 1px;
    background-color: gray;
}

.search .icon_search {
    position: absolute;
    top: 7px;
    left: 47px;
    height: 14px;
    width: 15px;
    /* 二倍精灵图 坐标变为实际测量的二分之一 */
    background: url(../images/jd-sprites.png) no-repeat -83px -0px;
    /* 图片宽高变为原来的二分之一 */
    background-size: 200px;
}

.search_wrap input {
    position: absolute;
    height: 16px;
    top: 6px;
    left: 76px;
    width: 69%;
    border: 0;
    outline: none;
}

.main_content {
    width: 100%;
    height: 500px;
}

.main_content .slider img {
    width: 100%;
}

.brand {
    /* margin-top: 5px; */
    overflow: hidden;
    border-radius: 15px 15px 0 0;
}

.brand a {
    float: left;
    display: block;
    width: 33.3333%;
    height: 100px;
}

.brand a img {
    width: 100%;
}

/* 导航栏 */
nav a {
    float: left;
    display: block;
    margin-top: 6px;
    width: 20%;
    height: 80px;
    font-size: 12px;
    color: #666;
    text-align: center;
}

nav a img {
    height: 40px;
    width: 40px;
    margin-bottom: 10px;
}

/* 快报 */
.news {
    width: 100%;
    height: 130px;
}

.news a {
    display: block;
    float: left;
}

.news a:first-child {
    width: 50%;
}

.news a:nth-child(n+2) {
    width: 25%;
    border-left: 1px solid #ccc;
}

.news a img {
    width: 100%;
}